feat: add sha256 signatures to outgoing http requests (#2874)

Gemfile

@@ -8,12 +8,12 @@ gem "chronic"
 gem "domain_name"
 gem "dotenv"
 gem "dynamic_form"
-gem "encrypto_signo"
 gem "execjs", "~> 2.7", "< 2.8"
 gem "gelf"
 gem "haml"
 gem "hashie"
 gem "highline", require: false
+gem "jwt"
 gem "kaminari"
 gem "klogger-logger"
 gem "konfig-config", "~> 3.0"